U.S. patent application number 16/052884 was filed with the patent office on 2019-03-21 for electronic device, light source unit and projector.
The applicant listed for this patent is CASIO COMPUTER CO., LTD. Invention is credited to Osamu Jobi, Tomoyuki Ueda.
Application Number | 20190086782 16/052884 |
Document ID | / |
Family ID | 65720193 |
Filed Date | 2019-03-21 |
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United States Patent
Application |
20190086782 |
Kind Code |
A1 |
Jobi; Osamu ; et
al. |
March 21, 2019 |
ELECTRONIC DEVICE, LIGHT SOURCE UNIT AND PROJECTOR
Abstract
An electronic device according to embodiments of the invention
include a fixing target member, a fixing portion having formed
thereon a frame portion that is erected around a circumference of
the fixing target member, a packing having a groove and disposed
between the frame portion and the fixing target member, a core
member disposed in the groove, and a pressing member that presses
the core member towards the packing.
Inventors: |
Jobi; Osamu; (Tokyo, JP)
; Ueda; Tomoyuki; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CASIO COMPUTER CO., LTD |
Tokyo |
|
JP |
|
|
Family ID: |
65720193 |
Appl. No.: |
16/052884 |
Filed: |
August 2, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G03B 21/16 20130101;
G03B 21/20 20130101; G03B 21/145 20130101 |
International
Class: |
G03B 21/20 20060101
G03B021/20; G03B 21/16 20060101 G03B021/16; G03B 21/14 20060101
G03B021/14 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 19, 2017 |
JP |
2017-179290 |
Claims
1. An electronic device comprising: a fixing target member; a
fixing portion having formed thereon a frame portion that is
erected around a circumference of the fixing target member; a
packing having a groove and configured to be disposed between the
frame portion and the fixing target member; a core member
configured to be disposed in the groove; and a pressing member
configured to press the core member towards the packing.
2. The electronic device according to claim 1, wherein the packing
is formed into a ring shape that surrounds lateral sides of the
fixing target member.
3. The electronic device according to claim 2, wherein the groove
is formed into a ring shape in a position between an inner
circumference and an outer circumference of the packing, and
wherein the core member is formed into a ring shape.
4. The electronic device according to claim 3, wherein the pressing
member presses portions of the core member that face each
other.
5. The electronic device according to claim 4, comprising: a
circuit board mounted on the fixing target member and having a
projecting portion, wherein the core member has a cut portion
between one end and the other end thereof, wherein the cut portion
of the core member is disposed near a center of one of the facing
portions of the core member, and wherein the facing portions of the
core member that the pressing member presses constitute an area
excluding a portion that corresponds to the projecting portion of
the circuit board.
6. The electronic device according to claim 2, wherein the packing
has a projection that extends along a full circumference of an
outer circumferential surface thereof.
7. The electronic device according to claim 3, wherein the packing
has a projection that extends along a full circumference of an
outer circumferential surface thereof.
8. The electronic device according to claim 4, wherein the packing
has a projection that extends along a full circumference of an
outer circumferential surface thereof.
9. The electronic device according to claim 5, wherein the packing
has a projection that extends along a full circumference of an
outer circumferential surface thereof.
10. The electronic device according to claim 6, wherein the
projection extends into a tongue-like shape from a side that lies
to face the fixing portion to a side that lies to face the pressing
member.
11. The electronic device according to claim 7, wherein the
projection extends into a tongue-like shape from a side that lies
to face the fixing portion to a side that lies to face the pressing
member.
12. The electronic device according to claim 8, wherein the
projection extends into a tongue-like shape from a side that lies
to face the fixing portion to a side that lies to face the pressing
member.
13. The electronic device according to claim 9, wherein the
projection extends into a tongue-like shape from a side that lies
to face the fixing portion to a side that lies to face the pressing
member.
14. The electronic device according to claim 1, wherein the groove
has a concave arc-shaped cross section, and wherein the core member
has a circular cross section.
15. The electronic device according to claim 2, wherein the groove
has a concave arc-shaped cross section, and wherein the core member
has a circular cross section.
16. The electronic device according to claim 3, wherein the groove
has a concave arc-shaped cross section, and wherein the core member
has a circular cross section.
17. The electronic device according to claim 4, wherein the groove
has a concave arc-shaped cross section, and wherein the core member
has a circular cross section.
18. The electronic device according to claim 1, wherein the fixing
portion has a positioning engaging portion, and wherein the fixing
target member has a positioning engaged portion that allows the
positioning engaging portion to be brought into engagement
therewith to position the fixing portion in a direction that is
perpendicular to a mounting direction.
19. A light source unit comprising: the electronic device according
to claim 1, wherein the fixing portion is provided in a light
source case in which an opening portion is formed in a fixing
position, wherein the fixing target member is a holder that holds a
light source, and wherein the pressing member is a heat sink for
the holder that is brought into abutment with the holder while
pressing the core member.
20. A projector comprising: the light source unit according to
claim 19; a display device on to which light source light from the
light source unit is shined to form image light; a projection-side
optical system configured to project the image light emitted from
the display device on to a screen; and a projector control unit
configured to control the display device and the light source unit.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is based upon and claims the benefit of
priority under 35 USC 119 from the prior Japanese Patent
Application No. 2017-179290 filed on Sep. 19, 2017, the entire
disclosure of which, including the description, claims, drawings
and abstract, is incorporated herein by reference.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The present invention relates to an electronic device, a
light source unit, and a projector.
Description of the Related Art
[0003] Data projectors are widely used on many occasions in these
days as an image projection system for projecting a screen of a
personal computer and a video screen, as well as images based on
image data recorded on a memory card or the like. In these data
projectors, light emitted from a light source is collected on to a
micromirror display device called a digital micromirror device
(DMD) or a liquid crystal panel to display a color image on a
screen.
[0004] Projectors have been expanding their applications from a
presentation on a commercial scene to a home use as video equipment
such as personal computers and DVD players have been propagating.
Conventionally, in the mainstream of these projectors,
high-intensity discharge lamps have been used as a light source. In
recent years, however, various types of projectors have been
developed which include, as a light source, a solid-state light
emitting device such as a laser diode, or a luminescent plate that
uses the solid-state light emitting device as an excitation light
source.
[0005] In some of these projectors, a configuration is adopted in
which a laser diode for emitting light is mounted in an interior
portion of a case that makes up a light source unit from outside.
For example, Japanese Unexamined Patent Publication No. 2016-177162
(JP-A-2016-177162) discloses a light source unit that includes a
heat dissipating unit and a holder that holds a plurality of blue
laser diodes that are semiconductor light emitting devices. The
heat dissipating unit is disposed so as to be in contact with a
surface on an opposite side to a side where the blue laser diodes
are disposed.
[0006] In recent years, projectors are used in an environment where
a dust-proof property is required. To meet this requirement, it is
desirable that a light source unit has a hermetically closed
construction. In particular, when laser diodes or LEDs are used,
once dust enters an optical path, a phenomenon is caused in which
the luminance of the laser diodes or LEDs is reduced by the dust.
To prevent the occurrence of such a phenomenon, a technique is
necessary of tightly closing a gap in the light source unit.
[0007] In the light source unit disclosed in JP-A-2016-177162,
however, no specific sealing construction is provided for sealing
the holder from the side where the heat dissipating unit is
disposed to the side where the blue laser diodes are disposed. Due
to this, it is assumed that foreign matters such as dust flow into
an interior portion of a case where optic members are disposed.
When foreign matters adhere to the optic members, guiding of light
within the light source unit is disturbed, as a result of which the
quality of light emitted by the light source unit is
deteriorated.
[0008] On the other hand, when the optic members are caused to
deviate from their designed positions, their optical properties are
deteriorated. To avoid this problem, the optic members need to be
prevented from deviating from their designed positions when a
dust-proof sealing member is disposed between a case and a fixing
target member.
SUMMARY OF THE INVENTION
[0009] The invention has been made in view of these situations, and
an object thereof is to provide an electronic device that improves
its dust-proof performance while reducing a risk of a fixing target
member of deviating from its designed position, a light source
unit, and a projector.
[0010] According to an aspect of the invention, there is provided
an electronic device including a fixing target member, a fixing
portion having formed thereon a frame portion that is erected
around a circumference of the fixing target member, a packing
having a groove and configured to be disposed between the frame
portion and the fixing target member, a core member configured to
be disposed in the groove, and a pressing member configured to
press the core member towards the packing.
[0011] According to another aspect of the invention, there is
provided a light source unit including the electronic device
described above, wherein the fixing portion is provided in a light
source case in which an opening portion is formed in a fixing
position, wherein the fixing target member is a holder that holds a
light source, and wherein the pressing member is a heat sink for
the holder that is brought into abutment with the holder while
pressing the core member.
[0012] According to a further aspect of the invention, there is
provided a projector including the light source unit described
above, a display device on to which light source light from the
light source unit is shined to form image light, a projection-side
optical system configured to project the image light emitted from
the display device on to a screen, and a projector control unit
configured to control the display device and the light source
unit.
BRIEF DESCRIPTION OF THE PREFERRED SEVERAL VIEWS OF THE
DRAWINGS
[0013] FIG. 1 is an external perspective view of a projector
according to a first embodiment of the invention,
[0014] FIG. 2 is a block diagram illustrating functional circuit
blocks of the projector according to the first embodiment of the
invention,
[0015] FIG. 3 is a schematic plan view illustrating an internal
construction of the projector according to the first embodiment of
the invention,
[0016] FIG. 4 is a schematic plan view of an interior portion of a
light source case of a light source unit according to the first
embodiment of the invention,
[0017] FIG. 5 is an exploded perspective view of an excitation
light shining device according to the first embodiment of the
invention,
[0018] FIG. 6 is a sectional view of a circumference of the
excitation light shining device of the light source unit according
to the first embodiment of the invention taken along a line VI-VI
shown in FIG. 3,
[0019] FIG. 7 is a sectional view of the circumference of the
excitation light shining device of the light source unit according
to the first embodiment of the invention taken along a line VII-VII
shown in FIG. 6,
[0020] FIG. 8 is a sectional view corresponding to the sectional
view of the circumference of the excitation light shining device
taken along the line VI-VI shown in FIG. 3, illustrating a case
where a packing according to a second embodiment of the invention
is used, and
[0021] FIG. 9 is a sectional view corresponding to the sectional
view of the circumference of the excitation light shining device
taken along the line VI-VI shown in FIG. 3, illustrating a case
where a packing according to a third embodiment of the invention is
used.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
First Embodiment
[0022] Hereinafter, a mode for carrying out the invention will be
described. FIG. 1 is an external perspective view of a projector
10. The projector 10 of the embodiment includes an upper main body
case 10a and a lower main body case 10b. A front panel 12, a back
panel 13, a right panel 14 and a left panel 15 that constitute side
panels of a casing of the projector 10 are erected downwards from
an outer circumferential edge of the upper main body case 10a.
Lower ends of the panels 12 to 15 come into abutment with an outer
circumferential edge of the lower main body case 10b. Consequently,
the projector 10 is formed into a substantially rectangular
parallelepiped shape. In description of this embodiment, when left
and right are referred to in relation to the projector 10, they
denote, respectively, left and right directions with respect to a
projecting direction of the projector 10. When front and rear are
referred to in relation to the projector 10, they denote,
respectively, front and rear directions with respect to the
direction of a screen and a traveling direction of a pencil of
light from the projector 10.
[0023] A keys/indicators unit 37 and a projection image control
unit 11a are provided on an upper panel 11 of the casing of the
projector 10. Disposed on this keys/indicators unit 37 are keys and
indicators including a power supply switch key, a power indicator,
a projection switch key, an overheat indicator, and the like. The
power indicator informs whether a power supply is on or off. The
projection switch key switches on or off the projection by the
projector 10. The overheat indicator informs of an overheat
condition occurring in a light source unit, a display device, a
control unit or the like when they really overheat. The projection
image control unit 11a includes one or a plurality of rotary knobs.
Operating this rotary knob controls the position of a movable lens
of a projection-side optical system, which will be described later
by reference to FIG. 4, to thereby control the size and focus of an
image to be projected. Although not shown, the projector 10
includes an Ir reception unit configured to receive a control
signal from a remote controller.
[0024] Outside air inlet holes 310 are provided in a front-right
corner portion 501 defined by the front panel 12 and the right
panel 14. A light emitting portion 12a, which is depressed into a
mortar-like configuration, is provided to the left of the front
panel 12. Outside air inlet holes 320 are formed in an inner wall
of the light emitting portion 12a that lies on a side of the left
panel 15. The projector 10 has the light emitting portion 12a, a
projection port 12b and a lens cover 19 that covers the projection
port 12b.
[0025] A height control button 12c is provided at a lower end of
the front panel 12. The projector 10 has a supporting leg inside
the front panel 12. In the projector 10, the supporting leg can be
controlled to appear from or disappear into the projector 10 while
the height control button 12c is kept pressed down. Thus, the user
operates the height control button 12c and fixes an amount of
protrusion of the supporting leg to control the height or
inclination of the projector 10.
[0026] Various types of terminals 20 including a USB terminal, a
video signal input D-SUB terminal, an S terminal, an RCA terminal
and the like which are provided in input and output connector unit
and a power supply adaptor plug and the like are provided on the
back panel 13. Additionally, outside air inlet holes 330 are formed
in a corner portion 503 defined between the back panel 13 and the
right panel 14. Inside air outlet holes 340 are formed in a corner
portion 504 defined between the back panel 13 and the left panel
15.
[0027] Next, a projector control unit of the projector 10 will be
described by the use of a functional circuit block diagram
illustrated in FIG. 2. The projector control unit includes a
control module 38, an input/output interface 22, an image
transforming module 23, a display encoder 24, a display driver 26
and the like.
[0028] The control module 38 governs the control of respective
operations of circuitries within the projector 10 and is made up of
a CPU, a ROM that stores operation programs of various types of
settings in a fixed fashion, a RAM that is used as a working memory
and the like.
[0029] Image signals of various standards that are inputted from
the input/output connector unit 21 are sent via the input/output
interface 22 and a system bus (SB) to the image transforming module
23 where the image signals are transformed so as to be unified into
an image signal of a predetermined format that is suitable for
display by the projector control unit. Thereafter, the unified
image signal is outputted to the display encoder 24.
[0030] The display encoder 24 deploys the inputted image signal on
a video RAM 25 for storage therein and generates a video signal
from the contents stored in the video RAM 25, outputting the video
signal so generated to the display driver 26.
[0031] The display driver 26 drives a display device 51, which is a
spatial optical modulator (SOM), at an appropriate frame rate in
response to the image signal outputted from the display encoder
24.
[0032] The projector 10 shines a pencil of light emitted from a
light source unit 60 on to the display device 51 by way of a light
guiding optical system, which will be described later, whereby an
optical image (an image) is formed by using reflected light
reflected by the display device 51. The projector 10 projects the
image so formed on to a screen for display thereon by way of the
projection-side optical system, which will also be described later.
A movable lens group 235 of the projection-side optical system is
driven by a lens motor 45 for zooming or focusing.
[0033] An image compression/expansion unit 31 performs a recording
operation in which a luminance signal and a color difference signal
of an image signal are data compressed through ADCT and Huffman
coding processes, and the compressed data is sequentially written
on a memory card 32 that constitutes a detachable recording
medium.
[0034] With the projector 10 set in a reproducing mode, the image
compression/expansion unit 31 reads out the image data recorded on
the memory card 32 and expands the individual image data that make
up a series of dynamic images frame by frame. Then, the image
compression/expansion unit 31 outputs the image data to the display
encoder 24 by way of the image transforming module 23 so as to
enable the display of dynamic images based on the image data stored
on the memory card 32.
[0035] Operation signals generated at the keys/indicators unit 37
that includes the main keys and indicators that are provided on the
upper panel 11 of the casing are sent out directly to the control
module 38. Key operation signals from the remote controller are
received by the IR reception unit 35 and are then demodulated into
a code signal at an IR processing unit 36 for output to the control
module 38.
[0036] The control module 38 is connected to an audio processing
unit 47 by way of the system bus (SB). This audio processing module
47 includes a circuitry for a sound source such as a PCM sound
source. With the projector 10 set in a projection mode and the
reproducing mode, the audio processing unit 47 converts audio data
into analog signals and drives a speaker 48 to output loudly sound
or voice based on the audio data.
[0037] The control module 38 controls a light source control
circuit 41 that is configured as a light source control module. The
light source control circuit 41 controls separately the operation
of an excitation light shining device of a green light source
device and a red light source device of the light source unit 60 so
that light of a predetermined wavelength range that is required in
forming an image is emitted from the light source unit 60. The
light of the predetermined wavelength range emitted from the light
source unit 60 is reflected on a shining mirror 185 to be shined on
to the display device 51.
[0038] The control module 38 causes a cooling fan drive control
circuit 43 to detect temperatures through a plurality of
temperature sensors which are provided in the light source unit 60
so as to control the revolution speeds of cooling fans based on the
results of the temperature detections. Additionally, when receiving
an instruction to switch off the power supply to the projector 10,
the control module 38 can also cause the cooling fan drive control
circuit 43 to keep the cooling fans rotating by use of a timer or
the like even after the power supply to a main body of the
projector 10 is switched off. Alternatively, the control module 38
can determine on a timing at which the power supply to the main
body of the projector 10 is cut off depending upon the results of
the temperature detections by the temperature sensors.
[0039] Next, an internal construction of the projector 10 will be
described. FIG. 3 is a schematic plan view illustrating an internal
construction of the projector 10. The projector 10 includes a power
supply unit 301, a control circuit board 302 and the light source
unit 60. Additionally, the projector 10 includes an outside air
inlet fan, an outside air inlet fan 270 and an inside air outlet
fan 280 as cooling fans.
[0040] The light source unit 60 is disposed substantially at a
center of the casing of the projector 10. The light source unit 60
accommodates optical members such as light sources, lenses, mirrors
and the like in an interior of a light source case 61. The light
source unit 301 is disposed on a side of the light source unit 60
that lies near to the left panel 15. A substrate of the power
supply unit 301 is disposed substantially parallel to the left
panel 15. The control circuit board 302 is disposed on a side of
the light source unit 60 that lies near to the back panel 13. The
control circuit board 302 is disposed substantially perpendicular
relative to an up-and-down direction. The control circuit board 302
includes a power supply circuit block, a light source control block
and the like. Additionally, a plurality of control circuit boards
302 can be provided separately to correspond to different functions
of the power supply block, the light source control block and the
like.
[0041] Here, an internal construction of the light source unit 60
will be described. FIG. 4 is a schematic plan view of the light
source unit 60. The light source unit 60 includes a red light
source device 120 that is a light source of light of a red
wavelength band or range, a green light source device 80 that is a
light source of light of a green wavelength band or range, and an
excitation light shining device 70 that is not only a blue light
source device that is a light source of light of a blue wavelength
band or range but also an excitation light source. The green light
source device 80 is made up of the excitation light shining device
70 and a luminescent plate device 100. The light source unit 60 has
a light guiding optical system 140. The light guiding optical
system 140 combines a pencil of light of the green wavelength
range, a pencil of light of the blue wavelength range and a pencil
of light of the red wavelength range together and then guides the
pencils of light of the green, blue and red wavelength ranges to
the same optical path.
[0042] The excitation light shining device 70 is disposed on a side
of the casing of the projector 10 that lies near to the right panel
14. The excitation light shining device 70 includes a plurality of
solid-state light emitting devices that are disposed so that
optical axes thereof are parallel to the back panel 13. The
solid-state light emitting devices of this embodiment are a
plurality of blue laser diodes 71 that emit light of the blue
wavelength range. The plurality of blue laser diodes 71 are
disposed parallel to the right panel 14. These blue laser diodes 71
are fixed to a holder (a fixing target member) 74.
[0043] In addition, the excitation light shining device 70 includes
a reflecting mirror 76, a diffusing plate 78, and a heat sink (a
pressing member) 81. The reflecting mirror 76 turns an axis of
light emitted from each of the blue laser diodes 71 through about
90 degrees towards the diffusing plate 78. The diffusing plate 78
diffuses light emitted from each of the blue laser diodes 71 and
reflected on the reflecting mirror 76 at a predetermined diffusing
angle. As shown in FIG. 3, the heat sink 81 is disposed between the
blue laser diodes 71 and the right panel 14.
[0044] Returning to FIG. 4, collimator lenses 73 are disposed
individually on optical paths of lights from the blue laser diodes
71, and the collimator lenses 73 enhance the directivity of lights
emitted from the blue laser diodes 71 and transform them into
parallel lights. These collimator lenses 73 are held on the holder
74 together with the blue laser diodes 71.
[0045] The red light source device 120 includes a red light source
121 that is disposed so that an optical axis thereof becomes
parallel to pencils of light of the blue laser diodes 71 and a
collective lens group 125 that collects light emitted from the red
light source 121. This red light source 121 is a red light emitting
diode that is a solid-state light emitting device emitting light of
the red wavelength range. The red light source device 120 is
disposed so that an axis of light of the red wavelength range
emitted from the red light source device intersects an axis of
light of the green wavelength range emitted from a luminescent
plate 101. The red light source device 120 includes a heat sink 130
on a side of the red light source 121 that lies near to the right
panel 14.
[0046] The luminescent plate device 100 that makes up the green
light source device 80 includes the luminescent plate 101, a motor
110, collective lenses 117a, 117b on an incident side and a
collective lens 115 on an emerging side. The luminescent plate 101
is a luminescent wheel that is disposed so as to intersect an axis
of light emitted from the excitation light shining device 70 at
right angles. This luminescent plate 101 is driven to rotate by the
motor 110. The collective lenses 117a, 117b collect pencils of
excitation light emitted from the excitation light shining device
70 on to the luminescent plate 101. The collective lens 115
collects pencils of light emitted from the luminescent plate 101
towards the front panel 12. The luminescent plate device 100 is
disposed above the collective lenses 117a, 117b, 115. Due to this,
part of a lower portion of the luminescent plate 101 is disposed on
an optical path of light emitted from the collective lenses 117a,
117b, 115.
[0047] A luminous light emitting area and a diffuse transmission
area are provided end to end in a circumferential direction on the
luminescent plate 101. The luminous light emitting area receives
light of the blue wavelength range emitted from the blue laser
diodes 71 as excitation light to emit excited luminous light of the
green wavelength range. The diffuse transmission area transmits
light emitted from the blue laser diodes 71 while diffusing it. The
diffuse light transmitted through the diffuse transmission area is
emitted as light of the blue wavelength range of the light source
unit 60.
[0048] The light guiding system 140 has a first dichroic mirror
141, a collective lens 149, a second dichroic mirror 148, a first
reflecting mirror 143, a collective lens 146, a second reflecting
mirror 145, and a collective lens 147. The first dichroic mirror
141 is disposed in a position where light of the blue wavelength
range emitted from the excitation light shining device 70 and light
of the green wavelength range emitted from the luminescent plate
101 intersect light of the red wavelength range emitted from the
red light source device 120. The first dichroic mirror 141
transmits light of the blue wavelength range and light of the red
wavelength range and reflects light of the green wavelength range.
An axis of the light of the green wavelength range reflected by the
first dichroic mirror 141 is turned through 90 degrees towards the
left panel 15 so as to be directed towards the collective lens 149.
Thus, an axis of the light of the red wavelength range that is
transmitted through the first dichroic mirror 141 coincides with
the axis of the light of the green wavelength range that is
reflected by the first dichroic mirror 141.
[0049] The collective lens 149 is disposed on a side of the first
dichroic mirror 141 that lies to be directed to the left panel 15.
The light of the red wavelength range that is transmitted through
the first dichroic mirror 141 and the light of the green wavelength
range that is reflected by the first dichroic mirror 141 are both
incident on the collective lens 149. The second dichroic mirror 148
is disposed on a side of the collective lens 149 that lies to be
directed to the left panel 15 and a side of the collective lens 147
that lies to be directed to the back panel 13. The second dichroic
mirror 148 reflects light of the red wavelength range and light of
the green wavelength range and transmits light of the blue
wavelength range. Thus, the light of the red wavelength range and
the light of the green wavelength range that are collected by the
collective lens 149 are reflected by the second dichroic mirror 148
to be turned through 90 degrees towards the back panel 13. A
collective lens 173 is disposed on a side of the second dichroic
mirror 148 that lies to be directed to the back panel 13. The light
of the red wavelength range and the light of the green wavelength
range that are reflected by the second dichroic mirror 148 are
incident on the collective lens 173.
[0050] The first reflecting mirror 143 is disposed on an axis or
optical path of the light of the blue wavelength range that is
transmitted through the luminescent plate 101, that is, between the
collective lens 115 and the front panel 12. The first reflecting
mirror 143 reflects light of the blue wavelength range and turns an
axis of the light of the blue wavelength range through 90 degrees
towards the left panel 15. The collective lens 146 is disposed on a
side of the first reflecting mirror 143 that lies to be directed to
the left panel 15. The second reflecting mirror 145 is disposed on
a side of the collective lens 146 that lies to be directed to the
left panel 15. The second reflecting mirror 145 turns an axis of
the light of the blue wavelength range that is reflected by the
first reflecting mirror 143 and is collected by the collective lens
146 through 90 degrees towards the back panel 13. The collective
lens 147 is disposed on a side of the second reflecting mirror 145
that lies to be directed to the back panel 13. The light of the
blue wavelength range that is reflected by the second reflecting
mirror 145 is transmitted through the second dichroic mirror 148 by
way of the collective lens 147 and is then incident on the
collective lens 173. The pencils of red, green and blue light that
are guided by the light guiding system 140 in the way described
above are guided on to the same optical path of a light source-side
optical system 170.
[0051] The light source-side optical system 170 includes the
collective lens 173, a light guiding device 175 such as a light
tunnel or a glass rod, a collective lens 178, a light axis turning
mirror 179, a collective lens 183, a shining mirror 185, and a
condenser lens 195. The condenser lens 195 emits image light that
is emitted from the display device 51 that is disposed on a side of
the condenser lens 195 that lies to be directed to the back panel
13 towards a projection-side optical system 220, and therefore, the
condenser lens 195 constitutes part of the projection-side optical
system 220.
[0052] Pencils of light emitted from the collective lens 173 are
incident on the light guiding device 175. The pencils of light that
enter the light guiding device 175 are transformed into pencils of
light whose intensities are distributed uniformly by the light
guiding device 175.
[0053] The light axis turning mirror 179 is disposed on an optical
axis of the light guiding device 175 on a side thereof that lies to
be directed to the back panel 13 via the collective lens 178.
Pencils of light emerging from an emerging port of the light
guiding device 175 are collected by the collective lens 178,
whereafter axes of the pencils of light are turned to be directed
towards the collective lens 183 by the light axis turning mirror
179.
[0054] The pencils of light that are reflected by the light axis
turning mirror 179 are collected by the collective lens 183 and are
then shined on to the display device 51 at a predetermined angle by
way of the condenser lens 195 by the shining mirror 185. A heat
sink 190 is provided on a side of the display device 51 that lies
to be directed to the back panel 13. The display device 51, which
is a DMD, is cooled by this heat sink 190. Plate surfaces of fins
that are formed on a rear side of the heat sink 190 are formed
perpendicular relative to the up-and-down direction.
[0055] The pencils of light, which are light source light, shined
on an image forming plane of the display device 51 by the light
source-side optical system 170 are reflected on the image forming
plane of the display device 51 and are then projected on to a
screen by way of the projection-side optical system 220 as
projected light.
[0056] The projection-side optical system 220 is made up of the
condenser lens 195, the movable lens group 235 and a fixed lens
group 225. The fixed lens group 225 is incorporated in a fixed lens
barrel. The movable lens group 235 is incorporated in a movable
lens barrel so as to be moved manually or automatically for zooming
and focusing.
[0057] By configuring the projector 10 in the way described
heretofore, when the luminescent plate 101 is rotated and lights
are emitted from the excitation light shining device 70 and the red
light source device 120 at different timings, lights of the red,
green and blue wavelength ranges are incident on the light guiding
system 175 by way of the light guiding optical system 140 and are
then incident on the display device 51 by way of the light
source-side optical system 170. Thus, the display device 51, which
is the DMD, of the projector 10 displays the red, green and blue
lights in a time sharing fashion according to data, whereby a color
image can be projected on to the screen.
[0058] Next, the configuration of the excitation light shining
device 70 will be described. FIG. 5 is an exploded perspective view
of the heat sink 81 of the excitation light shining device 70, the
holder 74 that is a fixing target member, a packing 91 and a core
member 92. FIG. 6 is a sectional view of a circumference of the
excitation light shining device 70 taken along a line VI-VI shown
in FIG. 3. FIG. 7 is a sectional view of the circumference of the
excitation light shining device 70 taken along a line VII-VII shown
in FIG. 6. In the following description of the excitation light
shining device 70, a side of the excitation light shining device 70
that lies to be directed to the light source unit will be described
as a front and a side of the excitation light shining device 70
that lies to be directed to the heat sink 81 will be described as a
rear thereof.
[0059] The heat sink 81 has a base member 811 and fin units 812
each made up of a plurality of fins. The base member 811 is formed
into a substantially rectangular plate. As shown in FIG. 6, the
base member 811 has fastening blocks 811a, 811b that are erected
towards the light source case 61 from an upper end portion and a
lower end portion thereof. The base member 811 has two screw
through holes 811d on each of an upper end side and a lower end
side thereof. The fastening blocks 811a, 811b each have a hollow
construction that penetrates therethrough in a left-and-right
direction. Abutment surfaces 811c of the fastening blocks 811a,
811b that lie to face a fixing portion 62 are formed as flat
surfaces.
[0060] In FIG. 5, the base member 811 and the fins of the fin units
812 are connected together by two heat pipes 813. The base member
811 and the heat pipes 813 are secured to each other through
brazing so that heat can be conducted therebetween. The fin units
812 are disposed on both ends of the base member 811.
[0061] The holder 74 has a substantially parallelepiped shape. The
holder 74 has a groove 741 that is formed so as to extend in a
longitudinal direction on a side that faces the heat sink 81. Two
middle walls 742, 743 are formed substantially at a center of the
groove 741 so as to extend in the longitudinal direction similarly.
The middle walls 742, 743 are provided parallel in the longitudinal
direction. A surface 74a of the holder 74 on the side where the
groove 741 is formed that include the middle walls 742, 743 is
formed substantially on the same flat plane (refer to FIGS. 6 and
7).
[0062] A circuit board 75 is disposed in the groove 741 of the
holder 74. The circuit board 75 has a substantially rectangular
shape having its major axis in the same direction as the
longitudinal direction of the holder 74. The circuit board 75 has a
wiring portion 751 that supplies electric power to the blue laser
diodes 71 and a connecting portion (a projecting portion) 752 that
is connected with a power supply and the control circuit. The
wiring portion 751 is formed narrower than the connecting portion
752. Two through holes 753, 754 are formed in the wiring portion
751 so as to extend in a longitudinal direction of the circuit
board 75. The middle wall 742 is inserted in the through hole 753,
and the middle wall 743 is inserted in the through hole 754,
whereby the wiring portion 751 is disposed in the groove 741. Screw
holes 744 are formed in four corners of the holder 74 so as to
penetrate the holder 74 in a font-and-rear direction from a heat
sink 81 side to a light source case 61 side of the holder 74.
[0063] Lateral end faces 74c, 74d of the holder 74 are formed into
a tapered shape as a result of the heat sink 81 side being formed
shorter than the light source case 61 side of the holder 74.
[0064] The packing 91 is formed of a soft elastic member of a
silicone rubber into a substantially rectangular ring shape. A side
of the packing 91 that faces the heat sink 81 is formed as a
substantially flat surface 91a. A groove 911 is formed on the flat
surface 91a. The groove 911 is disposed into a ring shape
substantially at a center between an outer edge 91al and an inner
edge 91a2 of the packing 91. The groove 911 has a substantially
concave arc-like cross-sectional shape. An opening portion 912
formed inside the packing 91 has a substantially rectangular shape
whose inner corner portions are substantially a right angle. Corner
portions of the outer edge 91a1 of the packing 91 are formed into
an arc shape.
[0065] An outside diameter of a cross section of the core member 92
is substantially the same as an inside diameter of the groove 911
of the packing 91, and the core member 92 is formed into a
substantially elongated rectangular ring as a whole. The core
member 92 has a substantially circular cross section. A hard member
of metal (for example, stainless steel) is used for the core member
92. Specifically, the core member 92 is formed by bending a
rod-like member into a substantially ring shape. Consequently,
although the core member 92 is formed into the ring shape, a cut
portion exists between one end and the other end of the core member
92.
[0066] The light source case 61 has the fixing portion 62 that is
expanded into a flange-like shape. The fixing portion 62
constitutes a fixing position where the holder 74 and the heat sink
81 are mounted or fixed to the light source case 61. A
substantially rectangular opening portion 621 is formed on a
central side of the fixing portion 62. Spaces outside and inside of
the light source case 61 are connected to each other through this
opening portion 621. A flat surface portion 622 is formed around
the opening portion 621 of the light source case 61. A step portion
623 is formed on the flat surface portion 622 so as to surround an
edge portion of the opening portion 621. The step portion 623 is
depressed into a substantially rectangular shape around the
circumferential portion of the opening portion 621.
[0067] A positioning projection 623a is formed on a portion of the
step portion 623 that lies on an upper longitudinal side of the
opening portion 621 (refer to FIG. 6). Additionally, three screw
holes 623b are formed in each of portions of the step portion 623
that lie on the upper and lower longitudinal sides of the opening
portion 621.
[0068] A substantially rectangular step portion 624 is formed on
each of short or lateral sides of the opening portion 621. The step
portion 624 is higher than a bottom surface of the step portion 623
and lower than the flat surface portion 622. A positioning engaging
portion 624a, which is a projection, and two screw holes 624b are
formed on each of the step portions 624.
[0069] A substantially rectangular frame portion 625 is formed on
the fixing portion 62 so as to be erected from the flat surface
portion 622. The frame portion 625 is provided on an outer
circumferential perimeter of the opening portion 621 so as to
surround the opening portion 621. Corner portions 625a of the frame
portion 625 are each formed into a substantially arc shape. Two
arc-shaped protuberant portions 625c are formed on each of an upper
side and a lower side that constitute longer sides of the frame
portion 625. A screw hole 625b is formed in each of the protuberant
portions 625c.
[0070] A damper member 626 in the form of a thin plate is disposed
on the flat surface portion 622 inside the frame portion 625. The
damper member 626 has a rectangular opening portion 626a whose bore
diameter is slightly greater than that of the opening portion 912
in a position corresponding to the opening portion 912. The damper
member 626 is formed so as to cover most of the step portion 623
(refer to FIGS. 5 and 6) and is formed so as to expose most of the
step portion 624 (refer to FIGS. 5 and 7). The damper member 626 is
disposed so as to be held by the flat portion 622 and the packing
91 with the excitation light shining device 70 assembled as shown
in FIGS. 6 and 7.
[0071] Next, an assembling method of the excitation light shining
device 70 will be described. Firstly, the holder 74 including the
circuit board 75, the packing 91 and the core member 92 are
assembled together to fabricate a temporary assembly 93. In
relation to the temporary assembly 93, firstly, the core member 92
is disposed within the groove 911 formed on the packing 91.
Thereafter, the holder 74 on which the blue laser diodes 71 and the
collimator lenses 73 are fixed in place is fitted in a front side
(a side where the light source case 61 is disposed) of the opening
portion 912 of the packing 91. The core member 92 may be disposed
in the groove 911 after the holder 74 has been fitted in the
opening portion 912.
[0072] After the holder 74, the packing 91 and the core member 92
are assembled into the temporary assembly, the circuit board 75 is
fixed to the holder 74, and circuits on the circuit board 75 are
connected electrically with the corresponding laser diodes 71. The
temporary assembly 93 of the holder 74, the packing 91 and the core
member 92 is inserted into the frame portion 625 in which the
damper member 626 is disposed on the flat surface portion 622. As
this occurs, since a slight clearance is defined between the outer
surface of the packing 91 and an inner surface of the frame, the
temporary assembly 93 is disposed easily within the frame portion
625. Additionally, the temporary assembly 93 is temporarily fixed
in place within the frame portion 625 by the tapered outer surface
of the packing 91. The positioning engaging portion 624a, which is
the projection, is inserted into a positioning engaged portion,
which is a hole portion, not shown, provided on a side of the
holder 74 that lies to face the fixing portion 62, whereby the
temporary assembly 93 is restricted from moving in a direction
perpendicular to a mounting direction of the holder 74. The
positioning engaged portion may be formed as a projection, and the
positioning engaging portion 624a may be formed as a hole
portion.
[0073] Thereafter, as shown in FIG. 6, the base member 811 of the
heat sink 81 is assembled to the fixing portion 62 side so as to
cover the holder 74 from the rear thereof. Fixing screws are
screwed into the screw holes 625b via the screw through holes 811d,
whereby the base member 811 is fixed to the fixing portion 62.
[0074] When the base member 811 is so fixed, the abutment surface
811c on the fixing portion 62 side of the base member 811 is
brought into abutment with the core member 92 to thereby press the
core member 92 towards the packing 91. Due to this, the base member
811 of the heat sink 81 functions as a pressing member. The base
member 811 of this embodiment presses an upper and lower side
portions P of the core member 92 that faces vertically (refer to
FIGS. 5 and 6) but does not press lateral side portions Q of the
core member 92 that faces horizontally (refer to FIGS. 5 and 7).
Namely, the connecting portion 752 of the circuit board 75 that is
disposed in the groove 741 of the holder 74 does not exist in a
position that corresponds to the holder 74. Thus, since the
connecting portion 752 of the circuit board 75 protrudes from the
holder 74, the core member 92 is never brought into contact with
the base member 811 of the heat sink 81, whereby the core member 92
is not pressed by the heat sink 81. Since the cut portion exists
between the one end and the other end of the core member 92 that is
formed substantially into the ring shape, the cut portion between
the one end and the other end of the core member 92 is disposed so
as to be located near a center of the longer or longitudinal side
of the core member 92 and is not disposed on the lateral sides of
the core member 92 that are located on the shorter or lateral sides
thereof so that the substantially ring-shaped member that is cut
can be pressed uniformly by the pressing member.
[0075] In this way, the circuit board 75 is mounted on the holder
74 and has the connecting portion 752. Additionally, the cut
portion between the one end and the other end of the core member 92
is disposed near the center of one of the portions of the core
member 92 that face each other vertically. Consequently, the facing
portions of the core member 92 that are pressed by the heat sink 81
constitute an area of the circuit board 75 that excludes the
connecting portion 752. When pressed by the core member 92, the
packing 91 is deformed in such a way that the packing 91 is
expanded in width inwardly and outwardly from the portion where the
groove 911 is formed. Consequently, the gap between the inner
circumferential surface of the packing 91 and the outer surface of
the holder 74 is sealed up, and a gap between an outer
circumferential surface of the packing 91 and an inner
circumferential surface of the frame portion 625 is also sealed up.
This enables the excitation light shining device 70 of this
embodiment to have a high dust-proof performance relative to the
outside and inside of the light source case 61.
[0076] When the base member 811 is fixed to the fixing portion 62
so as to cover the holder 74, a flat surface portion 811e of the
base member 811 that faces the holder 74 is brought into
substantially face-to-face abutment with a front surface 74a of the
holder 74. Due to this, heat generated mainly from the blue laser
diodes 71, which constitutes the light sources, is transferred to
the base member 811 by way of the holder 74, whereby the excitation
light shining device 70 is cooled by the heat sink 81.
Second Embodiment
[0077] Next, a second embodiment will be described. FIG. 8 is a
drawing showing a case where a packing 91A is applied to a sealing
construction of an excitation light shining device 70. In the
second embodiment, the packing 91A is used in place of the packing
91 of the first embodiment. In the description of the packing 91A
of this embodiment, like reference numerals will be given to
configurations like to those of the packing 91, and the description
there of will be omitted or simplified.
[0078] The packing 91A has a projection 913 that is formed along a
full circumference of an outer circumferential surface thereof. As
shown in FIG. 8, the projection 913 has a substantially arc-shaped
cross section. A contact portion of the packing 91A with an inner
circumferential surface of a frame portion 625 is formed into a
linear shape by the projection 913.
[0079] Consequently, when compared with the packing 91 on which the
projection 913 is not formed, the packing 91A can reduce the degree
of adhesion of the outer circumferential surface of the packing 91A
to the inner surface of the frame portion 625 while ensuring the
required dust-proof performance, enabling a holder 74 to be removed
easily from an inside of the frame portion 625.
Third Embodiment
[0080] Next, a third embodiment will be described. FIG. 9 is a
drawing showing a case where a packing 91B is applied to a sealing
construction of an excitation light shining device 70. In the third
embodiment, the packing 91B is used in place of the packing 91 of
the first embodiment. In the description of the packing 91B shown
in FIG. 9, like reference numerals will be given to configurations
like to those of the packing 91, and the description thereof will
be omitted or simplified.
[0081] The packing 91B has a projection 914 that is formed along a
full circumference of an outer circumferential surface thereof. The
projection 914 is supported in a cantilever-like fashion from a
fixing portion 62 side of a light source case 61 towards a base
member 811 to thereby be erected into a tongue-like configuration.
An outer surface of the projection 914 can be deformed easily
towards a groove 911 and is brought into abutment with an inner
circumferential surface of a frame portion 625 by virtue of a
spring-back force that attempts to move the projection 914 away
from the groove 911. Due to this, a gap between the packing 91B and
the inner circumferential surface of the frame portion 625 is
sealed up.
[0082] Consequently, when compared with the packing 91 on which the
projection 914 is not formed, the packing 91B can enables a holder
75 to be removed from an inside of the frame portion 625 while
ensuring the required dust-proof performance.
[0083] Thus, while the embodiments of the invention have been
described heretofore, the invention is not limited to those
embodiments. Thus, a rectangular or concave arc-shaped cut-out may
be provided on part of the straight-line portion of the groove 911
provided on the packing 91. By adopting this configuration, the
core member 92 can easily be removed from the packing 91, whereby
the pressure that expands the width of the packing 91 can easily be
released before the holder 74 is removed from the frame portion
625, thereby facilitating the removal of the holder 74 from the
frame portion 625.
[0084] In the embodiments that have been described heretofore, the
holder 74 is described as being the fixing target member. However,
the invention is not limited thereto, and hence, the holder 74 may
be made up of another member, provided that the member needs to be
fixed from outside and has a construction in which the member needs
to be sealed up from inside and outside. For example, in FIG. 3,
the fixing target member can be the red light source 121 of the red
light source device 120 or the heat sink 190.
[0085] The fixing method of the fixing target member described in
the embodiments can be applied not only to the light source unit 60
but also to an electronic device of electronic equipment or a
precision machine that requires a shielding construction to seal up
an interior of a case against dust, drip and water. The fixing
target member can be a member that needs to be fixed to such an
electronic device from outside and that needs to be sealed up from
inside and outside relative to the fixing portion.
[0086] In the embodiments that have been described heretofore, the
base member 811 of the heat sink 81 is described as being used as
the pressing member. However, the invention is not limited thereto,
and hence, a different member from the heat sink 81 may be used as
the pressing member, provided that the member can press the core
member 92.
[0087] In the embodiments that have been described heretofore, as
shown in FIG. 7, the holder 74 is described as being formed into
the tapered configuration in which the portion that faces the heat
sink 81 is shorter than the portion that faces the fixing portion
62. However, the invention is not limited thereto, and hence, the
holder 74 may be formed into a tapered configuration in which the
portion that faces the heat sink 81 is longer than the portion that
faces the fixing portion 62 or into a configuration in which the
holder 74 is not tapered in any way. As this occurs, the holder 74
may be inserted into the opening portion 912 so as to be mounted in
place therein after the packing 91 is inserted into the frame
portion 625 of the fixing portion 62.
[0088] In addition, the packing 91 and the core member 92 may be
formed into an integral part that is formed through multi-color
molding or the like. By adopting this configuration, when the
holder 74 is fixed to the fixing portion 62 or is removed from the
fixing portion, a step of fixing to or removing from the packing 91
can be omitted.
[0089] The pressing member such as the base member 811 may be
configured to press part or the whole of the sides that face the
core member 92 or may be configured to press the diagonal portions
of the core member 92.
[0090] Thus, as has been described heretofore, the light source
unit 60 of the invention includes the fixing target member (the
holder 74), the fixing portion 62 having formed thereon the frame
portion 625 that is erected around the circumference of the fixing
target member, the packing 91 that is disposed between the frame
portion 625 and the fixing target member, the core member 92 that
is disposed in the groove 911 that is formed on the packing 91, and
the pressing member (the heat sink 81) that presses the core member
92 towards the packing 91 to expand the packing 91 widthwise.
[0091] By adopting this configuration, the lateral pressure can be
applied to the direction that is substantially perpendicular to the
mounting direction of the fixing target member to seal up the gap
between the fixing target member and the fixing member 62, whereby
the load exerted in the mounting direction of the fixing target
member can be reduced. The sealing construction employing the
lateral pressure can realize the hermetically closed construction
even in a case where the holder 74 has only a small sitting surface
relative to the fixing portion 62 in the mounting direction.
Additionally, the sealing construction employing the lateral
pressure can reduce a sitting failure in relation to the mounting
direction that would otherwise be caused by the repulsion force of
the packing 91. In this way, it is possible to provide the
electronic device that improves the dust-proof performance while
reducing the positional deviation of the fixing target member, the
light source unit including this electronic device and the
projector including this light source unit.
[0092] According to the electronic device in which the packing 91
is formed into the ring shape that surrounds the lateral sides of
the fixing target member, the dust-proof sealing construction can
be formed along the full circumference of the outer circumferential
surface of the fixing target member.
[0093] According to the electronic device in which the groove 911
is formed into the ring shape in the position between the inner
circumference and the outer circumference of the packing 91, and
the core member 92 is formed into the ring shape, once part of the
core member 92 is pressed, the whole of the core member 92 can be
loaded with the pressure that forces the core member 92 towards the
packing 91.
[0094] According to the electronic device in which the pressing
member presses the portions of the core member 92 that face each
other, the groove can be pressed uniformly without pressing the
whole of the core member 92.
[0095] According to the electronic device in which the packing 91A
or 91B has the projection 913 or 914 that extends along the full
circumference of the outer circumferential surface thereof, the
adhesion of the outer circumferential surface of the packing 91A or
91B to the inner surface of the frame portion 625 can be reduced
while ensuring the dust-proof performance, whereby the holder 74
can be removed easily from the interior of the frame portion
625.
[0096] According to the electronic device in which the projection
914 extends into the tongue-like shape from the side of the packing
91B that faces the fixing portion 62 to the side of the packing 91B
that faces the pressing member, the holder 74 can easily be removed
from the interior of the frame portion 625 while ensuring the
dust-proof performance. In addition, since the projection 914 is
formed into the tongue-like shape, the projection 914 can have a
wide moving area, whereby the following performance of the
projection 914 relative to the irregularities on the inner
circumferential surface of the frame portion 625 can be improved to
thereby improve the dust-proof performance of the packing 91B.
[0097] According to the electronic device in which the groove 911
has the concave arc-shaped cross section and the core member 92 has
the circular cross section, since the adhesion of the packing 91 to
the core member 92 can be enhanced, the pressure exerted on the
core member 92 can be transformed efficiently into the pressure
that is exerted on the packing 91 to expand the packing 91
widthwise.
[0098] According to the electronic device in which the fixing
portion 62 has the positioning engaging portion, and the fixing
target member has the positioning engaged portion that allows the
positioning engaging portion is brought into engagement therewith,
the risk of the fixing target member deviating from the
predetermined position can be reduced by disposing the packing
91.
[0099] While the embodiments of the invention have been described
heretofore, these embodiments are presented as examples, and hence,
there is no intention to limit the scope of the invention by the
embodiments. These novel embodiments can be carried out in other
various forms, and various omissions, replacements and
modifications can be made thereto without departing from the spirit
and scope of the invention. Those resulting embodiments and their
modifications are included in the spirit and scope of the invention
and are also included in the scope of inventions claimed for patent
under claims below and their equivalents.
* * * * *